Drill head



July 14,1942.

DRILLHEAD Filed March 28, 1940 l 2 Sheets-Sheet 2 .lll

Patented July 14, 1942 DRILL HEAD Louis T. Rufus, Joliet, Ill.;Josephine G. Rufus administratrix of said Louis T. Rufus, deceasedApplication March 28, v194A), Serial No. 326,473

(Cl. Z55-69) 8 Claims.

This invention relates to drill heads and has relation more particularlyto a device of this kind of a character to be welded on any conveyorauger and is also of a detachable toothed type.

It is a particular object of the invention to provide a structurewherein the cutting teeth are held from falling out of the head duringand after drilling operations, and also to provide in a device of thiskind teeth of a type which are reversible thereby materially prolongingthe life of a tooth.

Another object of the invention is to provide a device of this kindwherein the detachable tooth is not wedged in place but is held inposition by providing the tooth intermediate its ends with one or moreshoulders with which coact parts carried by the head for maintaining atooth in place- The invention consists in the details of constructionand in the combination and arrangement of the several parts of myimproved drill head whereby certain important advantages are attainedand the device rendered simpler, less expensive and otherwise moreconvenient and advantageous for use, as will be hereinafter more fullyset forth.

The novel features of my invention will hereinafter be definitelyclaimed.

In order that my invention may be the better understand, I will nowproceed to describe the same with reference to the accompanyingdrawings, wherein:

Figure 1 is a fragmentary view of a drill head and associated teethconstructed in accordance with an embodiment of my invention;

Figure 2 is a sectional view taken substantially n the line 2-2 ofFigure 1;

Figure 3 is a sectional view taken substantially on the line 3 3 ofFigure 1;

Figure 4 is a detailed sectional view taken substantially on the line4--4 of Figure 1;

Figure 5 is a view in side elevation of a holding plate as comprised inthis embodiment of my invention;

Figure 6 is a View in side elevation of the plate as illustrated inFigure 5;

Figure '7 is a view in elevation of one of the teeth as illustrated inthe preceding figures unapplied;

Figure 8 is a fragmentary elevational view illustrating a drill headstructure in accordance with another embodiment of my invention;

Figure 9 is a detailed sectional view taken substantially on the line 99 of Figure 8';

Figure 10 is an elevational view showing the teeth' and the holdingplate or member as comprised in Figures 8 and 9 unapplied;

Figure 11 is a sectional view taken substantially on the line ll-II ofFigure 10;

Figure l2 is a view in side elevation of the head as illustrated inFigure 8 but at the opposite side thereof with a portion broken away;

Figure 13 is a detailed sectional view taken substantially on the lineI3--I3 of Figure l2;

Figure 14 is a fragmentary View partly in section and partly inelevation illustrating a further embodiment of my invention;

Figure 15 is a sectional view taken substantially on the line I5-l5 ofFigure 14;

Figure 16 is an elevational View illustrating tooth constructed inaccordance with a further embodiment of the invention.

In the embodiment of the invention as particularly illustrated inFigures 1 to 7 inclusive, H denotes a head cf desired configuration anddimensions and which is adapted to be welded in a Well-known manner to aconventional conveyor auger such as is used in the mining of coal.

The outer portion I of the headI-I is broad with its outer end faceoutwardlj7 converging to a point substantially at the transverse centerof the head. The outer portion I of the head H at opposite sides of itstransverse center is of increased thickness as indicated at 2 and 3 withsaid thickened portions disposed in opposite directions as particularlyillustrated in Figure 3. These portions 2' and 3 have disposedtherethrough the openings 4 which, of course, are at vthe opposite sidesof the portion I but are disposed inwardly in convergence and each ofsaid openings is also disposed lengthwise on a suitable curvature toreadily accommodate an end portion 5 of a tooth T. Each of the openings4 has its inner portion reduced at one side to provide an internalshoulder 6 for a purpose to be hereinafter more particularly referredto.

The tooth T is disposed lengthwise on a suitable curvature and one 4endportion of the tooth is laterally offset, as at 1, with respect to theother resulting in the shoulders 8 at opposite sides of the tooth T withone of the shoulders a slight distance in advance of the other. Theopposite end portions of th'e tooth T are in duplicate so that in usethe tooth may be readily reversed as the requirements of practice maynecessitate whereby the life of a tooth may be materially prolonged.

The outer end of the head H at the apex portion thereof is provided withan axially disposed socket 9 in which is to be inserted free of anywedging action an end portion of a holding plate I0. This plate I whilesubstantially snugly received within the socket 9 is freely applied orremoved. The plate IE), however, is held in applied or working positionWithin the socket 9 through the medium of a key I I herein disclosed asa headed pin inserted through registering openings I2 in the head H andthe plate I0. The plate ID is of such a length as to have an end portionthereof disposed substantially exteriorly of the head when the plate ispositioned within the socket 9, and said extended portion is providedwith a transversely disposed head I4 extending a slight distance beyondeach side of the plate Ill. The extended portions of this head I4 at therear thereof are provided with the oppositely directed fingers or lugsI5 substantially at right angles 'to the plate I0 for contact with theouter shoulders 8 of the applied teeth T to hold the inner shoulders 8of the applied teeth in close Contact with the internal shoulders 6whereby the teeth T are effectively maintained in applied or workingposition. The plate II] may be readily removed and replaced thusallowing the teeth T when desired to be reversed or replaced in anextremely easy manner yet without in any way retarding the effectivenessof the applied teeth during a working or cutting operation.

In the embodiment of my invention as just described it is believed to beobvious that only a single holding member, such as the plate I0, isrequired in order `to hold the teeth T in effective position withrespect to the head I-I.

As clearly indicated in Figure 3, the outer ends of the openings 4 andthe socket 9 are in communication and, therefore, it is believed thatfor the purpose of coverage the socket 9 and the openings 4 can beidentified in the claims as a single opening- In the embodiment of theinvention as illustrated in Figures 8 to 13 inclusive, the drill head Dis of `a type wherein each of the enlargements I6 and I'I at oppositesides of the head D have associated therewith two cutting teeth C. Thesecutting teeth C are similar in form and construction as the teeth Thereinbefore described yet in connection with each pair of teeth C adifferent retaining or holding means is used,

In this embodiment of my invention the enlargement I6 has disposedtherethrough a single relatively large opening I8 provided at itsforward end and at the outer side thereof with a transverse enlargementproviding a shoulder I9 with which contacts one of the intermediateshoulders of a `tooth C. .Snugly' engaged through the opening I8 is aholding plate 2I.

The under surface of this plate 2I is cut out therealong to provide therabbets 22 separated by a fiange 24. The forward end portion of the 60ange 24 is formed to provide at opposite sides thereof the spacedshoulders 25 which are contacted by certain of the shoulders 2U oftheapplied teeth C as is clearly illustrated in Figure 10 of the drawings.The outer end of the plate 2I to one side `thereof is provided with alug 2S formed to have -close contact with the outer forward shoulder 2l]of one of the teeth C as is also clearly illustrated in Figure 10.

The plate 2|, with the applied teeth'C, is inserted from without throughthe opening I8 until the inner shoulder 20 lof the applied toothsubstantially diagonally opposed `to the lug 2B has contact with theVshoulder I9 within the enlarged portion YIIz of the head D. After thisplacement a holding key 2'I is inserted through registering openings 28in the inner portion of the plate 2| and the head D. As is illustratedin Figure 8, this plate 2! is of a length to extend beyond the inner endof the enlargement I6 when in applied or working position. The eX- tentof insertion of the plate 2I inwardly of the opening I8 is also limitedby the Contact of the outstanding flange 29 at the forward end of theplate 2I with the outer face of the enlargement I6 of the head D.

The teeth C which coact with the enlargement I'I at the side of the headD opposite to the enlargement Ii each has an end portion insertiblethrough an individual or separate opening 30 and each of these openingsis provided with an interna-l shoulder 3l with which coacts the innershoulder 25 of an applied tooth C.

Insertible through the outer portion of the enlargement I'I andintersecting the openings 36 are the legs 32 of a U-shaped holding key33. The openings 34 in the head D, or more particularly the enlargementI'I, are so positioned as to have the legs 32 closely adjacent to theforward shoulders 20 of the applied teeth C whereby said teeth areeffectively maintained in assembled position. The U-shaped holding key33 or-its equivalent is employed in this embodiment of my invention assuch holding means can be provided to better advantage in connectionwith the holding plate 2 I.

In the embodiment of the invention as illustrated in Figures 14 and 15,the holding plate 35 is inserted through a suitably provided opening inthe drill head and is maintained in position by a suitable key passingthrough the opening 36 in the'inner end of the holding plate 35. Thecutting tooth A has its opposite end portions transversely offset, as at31, with the opposite end portions of the tooth A in duplicate. Theouter end of the member or plate is provided with an outstandingperpendicularly related ange 39 having therethrough an opening 39through which an end portion of the tooth A is inserted, the offsetportion 3l of the tooth providing shoulders to limit the extent of suchinsertion and for effectively maintaining the tooth A in place.

In Figure 16 of the drawings lis illustrated a tooth B wherein thedesired intermediate spaced shoulders 49 are provided by notching, as at4I, the opposite longitudinal marginal portions of the tooth B.

From the foregoing description itis thought to be obvious Ythat a drillhead constructed in accordance with my invention is Vparticularly welladapted for use by reason of the convenience and facility with which itmay be assembled and operated, and it will also be obvious that myinvention is susceptible of lsome change and modification withoutdeparting from the principles and spirit thereof and for this reason Ido not wish to be understood as 'limiting myself to the precisearrangement and formation of the several parts herein shown in carryingout my invention in practice except as hereinafter claimed.

I claim:

1. In a drill, the combination of a drill 'head having an opening, anelongated reversible cutter laterally offset at substantially itslongitudinal center lproviding oppositely directed shoulders at oppositesides of the cutter, either portion of the cutter at the opposite sidesof the offset being insertible within lthe opening of the head, andremovable Vmeans coacting with the head and one of the shoulders of theapplied cutter to hold ,the cutter against outward movement with respectto the head, said means including a freely removable key, said removablemeans as a unit being positioned a material distance inwardly of theouter end of the cutter.

2. In a drill, the combination of a drill head having an openingtherein, a pair of elongated cutters insertible within said opening,each of said cutters being reversible and having oppositely facingshoulders in its central part, a holding plate insertible within saidopening between the cutters, said plate having parts engageable withcertain of the shoulders of the cutters to hold the cutters in appliedposition, and removable means for maintaining the plate in Workingposition.

3. In a drill, the combination of a drill head having an openingtherein, a pair of elongated cutters insertible Within said opening,each of said cutters being reversible and having oppositely facingshoulders in its central part, a holding plate insertible within saidopening between the cutters, said plate having parts engageable withcertain of the shoulders of the cutters to hold the cutters in appliedposition, removable f means for maintaining the plate in workingposition, and means for limiting the extent of insertion of the plateand cutters within the opening.

4. In a drill, the combination of a drill head having an openingtherein, anelongated reversible cutter provided substantially midway itsends with oppositely facing shoulders, either end portion of the cutterbeing selectively inserted within the opening of the head, a plateremovably insertible within the head to a position offset with respectto the applied cutter, and a laterally disposed part carried by saidplate contacting with a shoulder of the applied cutter for holding thecutter against outward movement.

5. In a drill, the combination of a drill head having an openingtherein, a pair of elongated cutters insertible within said opening',each of said cutters being reversible and having oppositely facingshoulders in its central part, and a holding vplate insertible withinsaid opening between the cutters, said plate having parts engageablewith certain of the shoulders of the cutters to hold the cutters inapplied position.

G. In a drill, the combination of a drill head having openings therein,cutters insertible within said openings, each of said cutters beingreversible and having oppositely facing shoulders in their centralportions, and a holding member removably carried by the head and havingparts contacting with the forwardly disposed shoulders of the appliedcutters to hold said cutters against 'outward movement said holdingmember as a unit being lpositioned a material distance inwardly of theouter extremities 0f the cutters, the openings in the head being indifferent planes, said head between such openings being provided with anadditional opening in which the holding member is insertible.

7. In a drill, the combination of a drill head having an openingtherein, elongated cutters insertible within said opening, each of saidcutters having oppositely facing shoulders, a holding plate insertiblewithin said opening between the cutters, said plate having partsengageable with certain of the shoulders of the cutters to hold thecutters in applied position, and removable means for maintaining theplate in working position.

8. In a drill, the combination of a drill head having an openingtherein, elongated cutters insertible within said opening, each of saidcutters having oppositely facing shoulders, a holding plate insertiblewithin said opening between the cutters, said Plate having partsengageable with certain of the shoulders of the cutters to hold thecutters in applied position, and a member freely insertible Within thedrill head and through the inserted portion of the applied plate forholding the plate and cutters in position.

LOUIS T. RUFUS.

